I'm trying to do the most basic expect example but my script is not working. Here's the code:

#!/usr/local/bin/expect --
# wrapper to make passwd be noninteractive
# username is passed as 1st arg, passwd as 2nd
# Executable only by root

#added timeout to see where problem occurs
set timeout -1
spawn passwd [lindex $argv 0]
set pass [lindex $argv 1]
expect "password:"
send "$pass\r"
expect "password:"
send "$pass\r"
expect eof
#end script

Here's what happens when I run it:

[root@local root]# ./setpass test ashgt21
spawn passwd test
Changing password for user test.
New password: ashgt43
<HANGS HERE>

It looks like it is hanging expect the second password: prompt? It seems to be stuck after I sent the password the first time. Any ideas?

BTW, I can manually set the password after that script fails using the same password and user account (to rule out those 2 things as the problem):

[root@local root]# passwd test
Changing password for user test.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root@local root]#



Any ideas on what I'm doing wrong?

Here's the diagnostic output from expect:

[root@local root]# ./setpass test ashgt21
expect version 5.43.0
argv[0] = /usr/local/bin/expect argv[1] = -d argv[2] = ./setpass argv[3] = test argv[4] = ashgt21
set argc 2
set argv0 "./setpass"
set argv "test ashgt21"
executing commands from command file ./setpass
spawn passwd test
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {5021}

expect: does "" (spawn_id exp4) match glob pattern "password:"? no
Changing password for user test.

expect: does "Changing password for user test.\r\n" (spawn_id exp4) match glob pattern "password:"? no
New password:
expect: does "Changing password for user test.\r\nNew password: " (spawn_id exp4) match glob pattern "password:"? yes
expect: set expect_out(0,string) "password:"
expect: set expect_out(spawn_id) "exp4"
expect: set expect_out(buffer) "Changing password for user test.\r\nNew password:"
send: sending "ashgt21\r" to { exp4 }

expect: does " " (spawn_id exp4) match glob pattern "password:"? no
ashgt21

expect: does " ashgt21\r\n" (spawn_id exp4) match glob pattern "password:"? no

<HANGS HERE>

Found the solution, I need a sleep 1 statement after the expect password statements. Thank god for google!